Despite not being named in the original Highlanders squad for the 2021 Super Rugby season, Renton played for the side in their pre-season matches and after impressive displays, was added to the full squad for the remainder of the year.
Renton was named on the bench to play the Crusaders in Round 1 of the 2021 Super Rugby Aotearoa season and played his Highlanders debut. He ended up playing 12 games for the side during the 2021 season and was recognised as one of the standout performers. Hugh was part of the matchday 23 that played in Super Rugby Trans-Tasman final against the Blues.
He will return to play for the Tasman Mako in this year's Bunnings NPC where they will look to defend back-to-back Premierships.